recessed head machine screw

Italian translation: vite Phillips senza dado

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If you have an Air Operated Valve (AOV), ensure the air
supply pressure has been relieved and the supply line
disconnected from the valve housing. Remove the AOV
cap and discard the O-ring from underneath. Remove
the retainer ring and locknuts from the adjustment stem.
Remove the four 3/8 in. bolts and lockwashers from
the AOV housing. Carefully remove the AOV assembly
from the pump. Remove and discard the gasket and
clean the gasket areas. Remove the two recessed head
machine screws and the diaphragm cover plate.
Slide the diaphragm assembly out from the housing.
Remove the intermediate vent plate from between the
two diaphragms. Inspect the diaphragms, spring, and
valve for abrasions and replace if necessary.